I did the "no-poo" (terrible marketing) thing some time back and swear by it, even if there is an icky adjustment period. I don't know how well this will work

I did the "no-poo" (terrible marketing) thing some time back and swear by it, even if there is an icky adjustment period. I don't know how well this will work for deodorant. If this is something you want to undertake, I can suggest a couple of things: First, shave off your underarm hair. I have a rather keen sense of smell, to the point where I can find my own scent off-putting by evening. Without long strands of fur to cling to, the bacteria will not do as well. Second, experiment. You could try a left-right method, using one side of your body as control. You might also try putting some T-shirts in a plastic bag and getting someone else (someone you trust and would humor you with this endeavor) to try a whiff test to see what another vantage point has to offer. However, shave away. Helps quite a lot.